HIGH QUALITY MATERIALHigh carbon (65 ) steel material quickly and cleanly forms smooth, straight holes in hardwood or cork. 6 SIZESThere are 6 different diameters of bits of auger drill bit including 6mm, 8mm, 10mm, 12mm, 14mm,16mm, total length: 230mm/9.05'', to meet your various needs. HEXAGONAL SHANK DESIGN The unique design allows the hexagonal shank not to slip during operation, and the hexagonal shank can be used with hand drills and drills. drill presses. SELF DIRECTED THREAD HEAD The automatic threaded head on the front of the bit allows the bit to be positioned precisely and quickly on the wood for easier drilling. Large and wide blade central helical drill bit. The strong center design makes the bit stable and sturdy during the drilling process. The wide blade allows for faster drilling, makes it easier to chip away and softens the walls of the holes. DIY ACCESSORY High quality carbon steel auger tips are rust resistant and durable.